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An inability to maintain alertness without constant stimulation; drowsiness.

Example: The patient arouses easily when his name is called and answers your questions. If you pause for a moment, he falls asleep again.

APA Reference
Grinnell, R. (2016). Somnolence. Psych Central. Retrieved on May 24, 2018, from https://psychcentral.com/encyclopedia/somnolence/